Wave Optics — Physics STD 12 Science — Question

The relative atomic masses of many elements are not whole numbers because:

Two resistance wires on joining in parallel the resultant resistance is .  One of the wire breaks, the effective resistance is 2 ohms.  The resistance of the broken wire is

(a)

(b) 2 ohm

(c)

(d) 3 ohm

Select the correct statements:

1. A simple harmonic motion is necessarily periodic.
2. A simple harmonic motion is necessarily oscillatory.
3. An oscillatory motion is necessarily periodic.
4. A periodic motion is necessarily oscillatory.

In Thomson spectrograph experiment, four positive ions P,Q,R and S are situated on Y-X curve a shown in the figure

(a) The specific charge of R and S are same

(b) The masses of P and S are same

(c) The specific charges of Q and R are same

(d) The velocities of R and S are same

Which among the following can be used to analyze circuits?

According to the theory of relativity, all laws of nature are the same in reference frames that::

The concepts of holes is introduced based on:

A double convex lens of glass of m = 1.5 has radius of curvature of each of its surface is 0.2 m.  The power of the lens is

(a) + 10 dioptres

(b) – 10 dioptres

(c) – 5 dioptres

(d)  +5 dioptres

A network of four capacitors of capacity equal to   and   are conducted in a battery as shown in the figure. The ratio of the charges on   and   is

(a)

(b)

(c)

(d)

The nuclear reaction   (mass of deuteron = 2.0141 a.m.u. and mass of He = 4.0024 a.m.u.) is

(a) Fusion reaction releasing 24 MeV energy

(b) Fusion reaction absorbing 24 MeV energy

(c) Fission reaction releasing 0.0258 MeV energy

(d) Fission reaction absorbing 0.0258 MeV energy